The 25-year-old "Gossip Girl" star (and the face of Chanel's Mademoiselle bag) hit the stylish event in a sexy, backless silver gown by Chanel Couture. "The dress is actually made of jewelry," Lively told reporters. Although Lively took pains to hide her wedding and engagement bands in the gown's pockets, she eventually flashed the major bling to photographers.

Looking even more radiant than usual, an overjoyed Lively lit up when asked about her life these days. "Life is great!" gushed the star, who wore her own Christian Louboutin shoes for the event, plus a diamond broach. "I was so excited to be driving over here in the car in this beautiful outfit. It's like a Disney princess dress!"

The actress' husband made a much more low-key appearance inside the event. The scruffy "Safe House" actor, 35, arrived separately and couldn't keep his eyes off his bride, checking her out from across the room before meeting up.

Another big milestone for the newlywed actress? "Gossip Girl" begins shooting its very last episode on Wednesday. "Can you believe it?" Lively said. "And they actually don't tell us what happens. But they do reveal who 'Gossip Girl' is -- I will say that much."